Future Homes and Buildings Standards: what changes on site

After years of consultation, delay, and lobbying, the Future Homes and Buildings Standards are no longer a policy slogan or a consultation-stage sketch. On 24 March the government published its response to the 2023 consultation, laid the regulations, and issued new statutory guidance, turning what had been a long-running argument about where new-build standards should land into a live compliance framework for England. Ministers say the package follows more than 2,000 consultation responses and will put new homes and non-domestic buildings on a route to being “zero carbon ready” in use as the grid decarbonises.

That matters because the package is broader than the political shorthand of “the Future Homes Standard”. It amends the Building Regulations 2010, introduces a new functional requirement for on-site renewable electricity, and is backed by revised Approved Document L Volume 1 for dwellings, Approved Document L Volume 2 for buildings other than dwellings, and Approved Document F Volume 1 for dwellings. In other words, this is not a marginal uplift to SAP tables; it is a new operating assumption for how homes, blocks, mixed-use schemes, and non-domestic buildings are expected to be designed, serviced, and signed off.

From policy promise to live regulation

For dwellings, the government has ended up in a position that is both stricter and more flexible than many expected. The dwelling specification is built around low-carbon heating, improved airtightness, and decentralised mechanical extract ventilation, while the wider policy framework assumes a decisive shift away from fossil-fuelled new homes. Yet instead of simply embedding solar into the dwelling notional model at a single fixed level, ministers have created a new legal requirement — L3 — for a system of on-site renewable electricity generation on a dwelling or building containing a dwelling.

The practical effect is that solar becomes part of the compliance conversation on every scheme, but not in a way that pretends every roof is flat, south-facing, unshaded, and free of plant, access zones, parapets, or architectural compromises. The consultation response says the Secretary of State considers the requirement met where solar panels equivalent to 40% of each dwelling’s ground-floor area are installed, while the Approved Document also allows lower provision where design and surroundings make that unreasonable. If the available roof cannot deliver 720kWh a year — roughly less than two panels — then no solar may be required at all.

That nuance is likely to matter most on apartment schemes, constrained urban sites, and architect-led projects, where the headline promise that the majority of new homes will have solar fitted as standard quickly collides with roof geometry and building-safety reality. Buildings that contain dwellings and have a storey at least 18 metres above ground are exempt from the L3 requirement, and the government has also allowed for directly connected renewable systems outside a building’s curtilage in some circumstances. That leaves room for schemes that cannot make the simple political version of rooftop solar work without forcing bad design or awkward workarounds.

Where delivery friction starts

For contractors and developers, the most important dates are not the publication date but the transition dates. For non-higher-risk work, the regulations come into force on 24 March 2027, and a scheme can remain under the earlier rules only where the relevant notice or full plans application was submitted before then and the work on that particular building begins before 24 March 2028. For higher-risk building work, the corresponding trigger moves to 24 September 2027 and turns on a valid building control approval application to the regulator. The government is also revoking older transitional arrangements that had allowed some projects to continue building to 2010-era energy standards.

That is where this stops being an energy-policy story and becomes a construction-management one. A live consent is no longer enough on its own; programme, building-by-building commencement, façade strategy, roof layout, M&E coordination, and procurement timing now decide whether a project is genuinely grandfathered or is about to tip into a different compliance regime. March 2028 is the point at which the long argument about future standards becomes a site reality for a large chunk of the market, which is why the reaction from Jeff House, Director of External Affairs and Policy at Baxi, lands on a fair point: “owing to transitional arrangements March 2028 will be the pivotal moment where change really happens in practice.”

For non-domestic buildings, the Future Buildings Standard may yet prove the more disruptive part of the package for many readers. The government has set the notional building to include solar PV equivalent to 40% of the actual building’s foundation area for both top-lit and side-lit spaces, having retreated from the more aggressive consultation-stage idea of 75% coverage for top-lit spaces after concerns over rooflights, plant, safe maintenance access, and simple physical practicality. The final impact assessment still describes the preferred low-carbon heating route as heat pumps for side-lit spaces and electric radiant heating for top-lit spaces, which tells warehouses, sheds, schools, and commercial developers that electrification is no longer optional background noise.

Heat networks, meanwhile, survive the cut, but on a tighter basis. The government says there are now two routes for a new dwelling or a building other than a dwelling, including mixed-use buildings, to demonstrate compliance when connected to a new or existing heat network. It has also drawn a hard line on temporary heating before connection, stating that compliance will not be possible where fossil-fuel temporary systems are used. That will sharpen early-stage decisions on phased developments, regeneration jobs, and any scheme where the final energy centre arrives later than the shell.

There is another shift here that will matter just as much as the plantroom specification, and that is the move from pure design intent to evidence, commissioning, and handover. Regulation 40C requires information for homeowners of new dwellings to be provided in an appropriate format, while the revised guidance picks up Home User Guides, system-specific instructions, commissioning evidence, and smart-meter readiness. The consultation response also confirms that updated smart-meter good-practice guidance has been extended to all new buildings, not merely dwellings. That is a quiet but important warning to the industry that poor handover is no longer a side issue to be buried in an O&M pack.

The cost case is where the political sell meets the commercial headache. The government’s final impact assessment puts the weighted average increase in capital cost at £4,350 per dwelling in 2025 prices, with a business net present cost of £7.7bn and an equivalent annual net direct cost to business of £709m over the first ten years. Ministers argue, with reason, that building to a higher standard at the point of construction is cheaper than retrofitting later and that households should still be better off relative to a typical existing EPC D home. Developers, however, will see the near-term arithmetic first, especially where margins are already thin and redesign work arrives late.

House’s second point also deserves to stay in the piece because it captures a problem the official papers acknowledge. “On a practical note there is still much to do behind the scenes regarding the Home Energy Model (HEM) which is not yet ready, so Standard Assessment Procedure (SAP) V10.3 will be adopted as an interim measure.” The consultation response confirms exactly that direction: SAP 10.3 will be available alongside launch, while HEM is expected to become an approved calculation methodology no earlier than three months after publication, with dual running after that. The standard may finally be published, then, but parts of the compliance machinery are still moving under it.

Initial reception reflects that split between direction and delivery. UKGBC welcomed a more ambitious standard that puts rooftop solar and stronger efficiency at the centre of new homes and argued that it gives industry confidence to invest in skills and supply chains. The National Housing Federation similarly welcomed the clarity, the role of heat pumps, the place for solar, and the recognition that some schemes will need flexibility. Good Homes Alliance, by contrast, called the package an important baseline but warned that ventilation, affordability, climate resilience, and as-built performance remain unresolved. Even the Regulatory Policy Committee has said the impact assessment evidence remains not fit for purpose, which is less a verdict on the destination than a reminder that the government’s working was not immaculate.

There is one final wrinkle worth including because it shows how quickly the solar conversation is widening beyond fixed new-build compliance. The government used the same day to announce that plug-in solar panels should be available in shops within months, linking that push directly to the wider drive for clean homegrown power and to the new homes rules. Luke Osborne, Technical Director of Electrical Safety First, was right to inject some caution. “At present, plug-in solar systems supply power to household circuits in a way currently not permitted by regulations,” he said, adding that wiring-rule changes and fresh safety standards need to follow rapidly. That is not part of the Future Homes and Buildings Standards themselves, but it is a useful sign that the market now has a solar policy faster than its safety consensus.

For construction professionals, that is the real significance of the new standards. The government has finally fixed the direction of travel: low-carbon heating, on-site renewable electricity, tougher non-domestic assumptions, tighter transition rules, and more formal handover obligations. The argument now moves to delivery, where roof design, grid constraints, modelling, commissioning, competence, and evidence will decide whether the Future Homes and Buildings Standards feel like overdue clarity or a very expensive lesson in how late policy certainty can arrive.